National Highways Authority Of India [NHAI] — Collected extra toll fas tag +cash

Paid extra toll, this is message i received (Dear Customer, Your FasTag A/c has been debited for Rs. 20 for transaction by Vehicle KA03NB0008 at Toll Plaza 1 @ Km 14+825 on[protected]T14:13:05. Balance amount in the A/c is Rs. 308.38 - HDFC Bank Ltd.)
But toll collection guy operator ID :6017 collected double i, , e ₹40 saying you have no balance ticket number#M4742309EZ